Method and apparatus for performing dynamic mechanical analyses

a dynamic mechanical analysis and analysis method technology, applied in the direction of measuring devices, material strength using repeated/pulse forces, instruments, etc., can solve the problem of displacement not representing an effective tensile elongation of the entire specimen, the damping constant of an elastic specimen cannot be determined, and the specimen is not coupled correctly to the excitation devi

Inactive Publication Date: 2003-10-09
METTLER TOLEDO GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

0007] It is therefore the objective of the present invention to propose a method and an apparatus that keep a dyn...

Problems solved by technology

If the pre-tension is less than a minimally required pre-tensioning force, the specimen is not coupled correctly to the excitation device.
In this condition, even a small increase of the force can cause a relatively large amount of displacement, but becau...

Method used

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  • Method and apparatus for performing dynamic mechanical analyses
  • Method and apparatus for performing dynamic mechanical analyses
  • Method and apparatus for performing dynamic mechanical analyses

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Embodiment Construction

[0029] FIG. 1 illustrates an apparatus 1 for performing dynamic mechanical analyses on a test specimen 2. The specimen 2 is held by a holder device 3, and an excitation device 4 applies a static pre-tensioning force and a time-variable excitation force to the specimen. The deformation of the specimen 2 is measured by at least one displacement sensor 5. The apparatus 1 preferably includes a force sensor 6 which can measure the entire force applied to the specimen 2 or may be designed to measure only the dynamic portion of the force. The excitation device 4, the displacement sensor 5, and the force sensor 6 which may be provided in some embodiments of the apparatus are tied to a control- and data-collecting device 7 which is connected to an operating device or input / output device 8. It is considered self-evident that the displacement of the lower end of the specimen could also be transmitted through a transfer mechanism to a displacement sensor mounted in the upper part of the apparat...

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PUM

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Abstract

In a dynamic mechanical analysis, a test specimen (2) is coupled to an excitation device (4) by means of a holder device (3). The excitation device (4) applies an excitation force comprised of a static pre-tensioning force component and a time-variable force component to the test specimen, and a deformation of the test specimen (2) is measured by means of one or more displacement sensors (5). The method includes a test phase with the steps: applying the excitation force to the test specimen; while said excitation force is in effect, determining at least one decision parameter, said decision parameter being indicative of a degree of slack in said coupling of the test specimen; comparing said decision parameter to at least one reference value; based on said comparison, determining whether or not the test specimen is coupled to the excitation device in a completely slack-free state, so that physical values derived from said measurements of the deformation will not be subject to errors caused by an insufficient amount of said pre-tensioning force component.

Description

[0001] The invention relates to a method of performing dynamic mechanical analyses, wherein a specimen under investigation is held in a holder device and is subjected to a static pre-tensioning force and a time-variable excitation force generated by an excitation device, and wherein the deformation of the specimen is measured by means of one or more displacement sensors. The invention further relates to an apparatus for performing the method. Included in the apparatus are a controller device that directs and controls the analysis process, a holder device for holding the specimen, an excitation device that allows a static pre-tensioning force and a time-variable excitation force to be applied to the specimen, and one or more displacement sensors to measure the deformation of the specimen.[0002] Dynamic mechanical analyses (DMA) are used to determine visco-elastic material properties. To perform a dynamic mechanical analysis, the samples to be investigated are clamped in specimen hold...

Claims

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Application Information

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IPC IPC(8): G01N3/00G01N3/02G01N3/04G01N3/08G01N3/38
CPCG01N3/08G01N3/38G01N2203/0003G01N2203/0007G01N2203/0226G01N2203/0037G01N2203/005G01N2203/0208G01N2203/0222G01N2203/0017
Inventor ESSER, ULRICHHUTTER, THOMAS
Owner METTLER TOLEDO GMBH
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